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W. L. COOK.

PROTECTOR: APPUCAHON mac F5319. 2921-.

1 34945 53243 Patented May 20, v1919.

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WALLACE L. COOK, OF CHICAGO, ILLINOIS.

PROTECTOR.

Specification of Letters Patent.

Patented May 20, 1919.

Application filed February 9, 1917. Serial No. 147,547.

To all whom it may concern:

Be it known that I, WALLACE L. Cook, a -citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Protectors, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to fuses and has for its object the provision of an improved type of pencil fuse structure. Pencil fuses in general are constructed of a cylindrical shell provided with end caps.

My invention concerns itself more particularly with the construction of a simple, efiicient and cheap end cap having means for permitting the ready replacement of burnt out fuse wires.

I will explain one form which my invention may take more in detail by referring to the accompanying drawing, in which-- Figure 1 is a side view of a pencil fuse constructed in accordance with my invention, shown in connection with spring mounting clips;

Fig. 2 is a sectional view on line 22 of Fig. 1;

Fig. 3 is a fragmentary enlarged side view of my pencil fuse structure;

Fig. 1 is a top view of the structure shown in Fig. 3, certain parts being broken away more clearly to reveal features of construction;

Fig. 5 is an end view of the pencil fuse, and

Fig. 6 is a sectional view on line 6-6 of Fig. 3.

My improved pencil fuse includes a cylindrical element 10 made of insulating material which is provided with two end caps 11, 11. These end caps each have a skirt portion 12 which is adapted to inclose the cylindrical portion 10 and to be held in place thereon by the indentation 13 formed in the skirt portion 12. The free extremities of the skirt portion 12 are punched into flattened form so as to provide flattened extensions 14 adapted to enter between spring clips 15, 15. These spring clips, as shown more clearly in Fig. 2, support the pencil fuse in position. The end caps 11 are hollow throughout, as more clearly apparent from Figs. 2 and 6. The great advantage of this hollow structure is to permit ready insertion and withdrawal and also manipulation of the fuse Wire 16, which fuse wire extends through the pencil fuse from end to end, protruding through the holes 17 provided in the extremities, or flattened portions of the end caps 12. The extremities of the fuse wire then rest on the outermost edge of the flattened portion and have their free ends soldered in place as shown at 18. The fiattened portions 152 of the caps have longitudinally extending ridges 19 which form a guide for the protection of the fuse wire protruding through the hole 17 These end caps are punched from a single piece of metal, whereby they may be made in a very inexpensive manner.

As already stated, a groove 20 is formed between the ridges 19, 19 to thoroughly protect the. fuse wire.

From what has been thus described the nature of my invention will be readily clear, and having thus described one form which it may take, what I claim as new and desire to secure by Letters Patent is:

1. A pencil fuse having an end cap, said end cap being punched from a single piece of metal and having an annular skirt portion adapted for association with the tube of said pencil fuse, and having a flattened extension adapted for association with a contact terminal, said end cap being hollow throughout and of greater internal width than the fuse wire to permit of the repeated insertion and withdrawal of a fuse wire throughout the length of said cap.

2. A pencil fuse having an end cap, said end cap being punched from a single piece of metal and having an annular skirt portion adapted for association with the tube of said pencil fuse, and having a flattened extension adapted for association with a contact terminal, said end cap being hollow throughout, said end cap having a hole punched in its end face to permit the fuse wire to pass therethrough, said end face having a groove to protect said fuse wire.

3. A pencil fuse having an end cap, said end cap being punched from a single piece of metal and having an annular skirt portion adapted for association with the tube of said pencil fuse, and having a flattened extension adapted for association with a contact terminal, said end cap being hollow throughout, said end cap having a hole punched in its end face to permit the fuse wire to pass therethrough.

4. A pencil fuse having an end cap, said end cap being punched from a single piece of metal and having an annular skirt portion adapted for association with the tube of said pencil fuse, and having a flattened extension adapted for association With a contact terminal, said end cap being hollow throughout and of greater internal Width than the fuse Wire to permit of repeated insertion and Withdrawal of the fuse Wire throughout the length of said cap, the greatest Width of said flattened extension being substantially equal to the diameter of said skirt portion.

In Witness whereof, I hereunto subscribe 15 niy7name this 6th day of February, A. D. 191

WALLACE L. COOK.

Witnesses:

HAZEL A. JONns, MAX W. ZABEL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

